would make more sense for Kiyo to swap with Kaza and be snuggin Haya rather than Yuu...
But this is cute so it's k
Actually it is more towards the personality part. Kiyo and Maki are more of the kiddy bunch so they will be together with big sis Yuu.Taka and Oki are the more timid so they are with the tougher Naga.Not too sure about Kaza Asa and Haya.